package java67_19;

import java67_17.jiekou.SoundCard;
import java67_17.jiekou.pc.USB;
import java67_17.jiekou.pc.USBFan;

public class PCIToUSB {

	public static void main(String[] args) {
//		SoundCard sc = null;
//		USB u = (USB) sc;
		USBFan f = null;
		System.out.println("这个设备的工作电压是" + f.V);
		// f.work();
		f.print();// USBFan.print()
	}

}
